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Conditions of Use <br />Any time concrete is used, utilize these management practices. Concrete construction project com- <br />ponents include, but are not limited to: <br />• Curbs <br />• Sidewalks <br />. Roads <br />. Bridges <br />. Foundations <br />. Floors <br />. Runways <br />Disposal options for concrete, in order of preference are: <br />1. Off -site disposal <br />2. Concrete wash -out areas (see BMP C 154: Concrete Washout Area) <br />3. De minimus washout to formed areas awaiting concrete <br />Design and Installation Specifications <br />. Wash concrete truck drums at an approved off -site location or in designated concrete <br />washout areas only. Do not wash out concrete trucks onto the ground (including formed areas <br />awaiting concrete), or into storm drains, open ditches, streets, or streams. Refer to BMP <br />C 154: Concrete Washout Area for information on concrete washout areas. <br />Return unused concrete remaining in the truck and pump to the originating batch plant <br />for recycling. Do not dump excess concrete on site, except in designated concrete <br />washout areas as allowed in BMP C 154: Concrete Washout Area. <br />• Wash small concrete handling equipment (e.g. hand tools, screeds, shovels, rakes, floats, <br />trowels, and wheelbarrows) into designated concrete washout areas or into formed areas <br />awaiting concrete pour. <br />• At no time shall concrete be washed off into the footprint of an area where an infiltration fea- <br />ture will be installed. <br />• Wash equipment difficult to move, such as concrete paving machines, in areas that do not dir- <br />ectly drain to natural or constructed stormwater conveyance or potential infiltration areas. <br />• Do not allow washwater from areas, such as concrete aggregate driveways, to drain directly <br />(without detention or treatment) to natural or constructed stormwater conveyances. <br />• Contain washwater and leftover product in a lined container when no designated concrete <br />washout areas (or formed areas, allowed as described above) are available. Dispose of con- <br />tained concrete and concrete washwater (process water) properly. <br />2019 Stormwater Management Manual for Western Washington <br />Volume ll - Chapter 3 - Page 316 <br />